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• If the Incoming packet has a destination IP address that matches the subnet broadcast address of any
interface, the unaltered packet is routed to the matching interfaces.
Troubleshooting UDP Helper
To display debugging information for troubleshooting, use the debug ip udp-helper command.
Example of the debug ip udp-helper Command
Dell(conf)# debug ip udp-helper
01:20:22: Pkt rcvd on Te 5/0 with IP DA (0xffffffff) will be sent on Te 5/1 Te
5/2 Vlan 3
01:44:54: Pkt rcvd on Te 7/0 is handed over for DHCP processing.
When using the IP helper and UDP helper on the same interface, use the debug ip dhcp command.
Example Output from the debug ip dhcp Command
Packet 0.0.0.0:68 -> 255.255.255.255:67 TTL 128
2005-11-05 11:59:35 %RELAY-I-PACKET, BOOTP REQUEST (Unicast) received at
interface
172.21.50.193 BOOTP Request, XID = 0x9265f901, secs = 0 hwaddr = 00:02:2D:8D:
46:DC,
giaddr = 0.0.0.0, hops = 2
2005-11-05 11:59:35 %RELAY-I-BOOTREQUEST, Forwarded BOOTREQUEST for 00:02:2D:8D:
46:DC
to 137.138.17.6
2005-11-05 11:59:36 %RELAY-I-PACKET, BOOTP REPLY (Unicast) received at interface
194.12.129.98 BOOTP Reply, XID = 0x9265f901, secs = 0 hwaddr = 00:02:2D:8D:
46:DC,
giaddr = 172.21.50.193, hops = 2
2005-07-05 11:59:36 %RELAY-I-BOOTREPLY, Forwarded BOOTREPLY for 00:02:2D:8D:
46:DC to
128.141.128.90 Packet 0.0.0.0:68 -> 255.255.255.255:67 TTL 128
458
IPv4 Routing